Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd4eec20af7974b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 17:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3b88d1c4ca621097820a7762cf2a2512 SHA-1: 27fe60ce5454cd271c8ed7138ef7d2a0b54d52e3 SHA-256: 4bd4eec20af7974bd2227f37e7997ff109b0c3d3d7a3aa5c6fd5c68d4bf165a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=what+is+url+of+google+classroom PDF link annotation
    • http://kamikofonem.mygamesonline.org/maxurojinolaxonag.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/toner_pour_hp_laserjet_1320n.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jghahjb/cat_jumping_on_counter.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/gexU4jd/babifexenulafutimota.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuburi/hgggFaF/ugandan_president_speech_on_covid_19_war.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hnhwgc2/60118840691.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/59079031643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ligujizulogi.atwebpages.com/brasart_hct_bula.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_fe3be4d2f9994007a5dc9380fa68a852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/school_things_vocabulary_worksheets.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_d43b9b1b686342adabc03c1c1d135cf6.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_4434e2a470724c0ca5b72d7781061694.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/biometric_time_attendance_system_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/pajonabur.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/adept_verb_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/maha_powerex_mh-c9000_manual.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_81354cb18a6e479d85f44f0b2c44036e.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_be4cbab5eb2c4f2c81c450510c5390f9.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_2f14667b0cbe4f9480ddbe61a68a4b7b.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_38b3915d0a1b4ce588137b45434b8adf.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/wade_s_rules_boranes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 5084 bytes
SHA-256: 91cdd914f86018b6e0619e850c4efa2518bae2188634477651bec450cff493a1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11612 bytes
SHA-256: f94eb3ea51b137b10dc6ffb94a120fb1df62aab7445fbb854b6f8161fd03081f
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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